Rovnguy, you owe it to yourself to do a search on ebay to see what CL's are going for. I just checked & here's a quick summary of what I found on recently closed sales.
Two bodies have sold - one @ $355 & the other @ $570. The difference is that the first is in "very good - excellent condition", meaning a few dings, i.e. what might be expected of a 30 year old camera while the other had a recent CLA & was in "mint" condition. Four others sold with one or more lenses, prices ranging from $500-$750. All were exceptional buys. Two had recent CLAs, one with warranty. A third was in "like new" condition. The fourth included 2 lenses with filters, meter, flash, & 2 cases.
Two others with 40mm lens failed to sell because bids did not meet the reserve - one a collectible "50 Jahre" edition @ $910 & the other @ $560.
Two Leica 50 Summicrons from the '70s sold recently for $530 & $630. This is normally the price range for the current version on ebay. I think the difference for these 2 is that they were made in Germany ("Wetzlar" version) & I believe that many of the '70s Summicrons were made in Canada, which fetch a lower price. Another 50 Summicron from the '60s sold for $257. This may have been a Christmas bargain because these normally sell for at least $100 higher than this.
Take what yo will from this information, but my take on it is that two factors come into play on this purchase. First, the body would only sell for this price with lens if there is something special about it - mint, CLA, warranty, or something like that. A CLA could cost you anywhere from $100-$300 extra. Second, the value of the 50/2 Summicron will be a big factor in the price. A Wetzlar version on a camera in top condition with a CLA or warranty would make this a reasonable price from a dealer IMO.
The prices I quoted are ebay prices & would normally also include a small additional charge for shipping. Dealer asking prices would normally be higher. In this case, you have the advantage of being able to personally inspect the camera & avoid shipping.
Another comparison might be with a new Voigtlander Bessa R2 @ $550 with warranty + used Leica 50/2 which could be had for only a little more.